8.3.64
स्थाऽऽदिष्वभ्यासेन चाभ्यासस्य
Operational rule vidhi
In स्था etc. up to सित् exclusive -- उपसर्गात् सुनोतिसुवतिस्यतिस्तौतिस्तोभतिस्थासेनय सेधसिचसञ्जस्वञ्जाम् (8.3.65) to परिनिविभ्यः सेवसितसयसिवुसहसुट्स्तुस्वञ्जाम् (8.3.70), this substitution of ष् takes place then also, when the reduplicate intervenes and the स of the reduplicate is also changed to ष.
Word by word (padaccheda)
Right context स्थाऽऽदिषु saptamī · bahuvacanaWith / by tṛtīyā · ekavacanaIndeclinable च avyayaTarget ṣaṣṭhī · ekavacana
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
- With / by Tṛtīyā (3rd case): accompaniment or means.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Dotted words are technical terms. Hover or tap one to see its card.
Full reading
स्थाऽऽदिषु च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In स्था etc. up to सित् exclusive -- उपसर्गात् सुनोतिसुवतिस्यतिस्तौतिस्तोभतिस्थासेनय सेधसिचसञ्जस्वञ्जाम् 8.3.65 to परिनिविभ्यः सेवसितसयसिवुसहसुट्स्तुस्वञ्जाम् 8.3.70, this substitution of ष् takes place then also, when the reduplicate intervenes and the स of the reduplicate is also changed to ष।
The words प्राक् सितात् are understood here also. The स्यादि roots are, स्था, सेनय &c in 8.3.65 and ending with सेव् in 8.3.70. The sutra consists of two sentences : (1) The षत्व takes place in स्था &c. even when a reduplicate intervenes; (2) The स of the reduplicates of स्था &c. is changed to ष ॥ The first is a vidhi rule, and the second is a niyama rule.
Thus परितष्ठौ where the abhyasa त intervenes. This applies even to roots other than those which have been taught with a ष in the Dhatupatha. As अभिषिषेणयिषति, परिषिषेणयिषति (सेनया अभियातुमिच्छन्ति). This applies moreover to reduplicates which end in अ, as अभितष्ठौ; here the स् would not have been changed to ष (by 8.3.59) as it is not preceded by इ or उ ॥ Another raison d'etre of this sutra is that it prohibits षण् 8.3.61. As अभिषिषिक्षति, परिषिषिक्षति ॥
The word अभ्यासस्य is for the sake of niyama, as we have said above. स of स्था &c. and of no other roots is changed to ष ॥ As अभिसुसूषति from षू प्रेरणे with सन्, the augment is debarred by 7.2.12: the root स् is unchanged by the niyama prohibition of 8.3.61; the reduplicate स् remains unchanged by the restriction of the present sutra.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.